personality disorder

noun Psychiatry.
any of a group of mental disorders characterized by deeply ingrained maladaptive patterns of behavior and personality style, which are usually recognizable as early as adolescence and are often lifelong in duration.

Origin:
1935–40

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Collins
World English Dictionary
personality disorder
 
n
psychiatry any of a group of mental disorders characterized by a permanent disposition to behave in ways causing suffering to oneself or others

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

personality disorder n.
Any of a group of disorders in which patterns of perceiving, relating to, and thinking about one's self and one's environment interfere with the long-term functioning of an individual, often manifested in deviant behavior and lifestyle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
personality disorder   (pûr'sə-nāl'ĭ-tē)  Pronunciation Key 
Any of a group of psychiatric disorders in which a person's abnormal self-perception or ability to relate to others results in undesirable behaviors and interferes with normal social and emotional functioning.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
She points out that she is not talking about multiple personality disorder,
  which has specific clinical signs.
My sister probably has borderline personality disorder.
The groups were tested for antisocial personality disorder, psychopathy, and
  aggression.
Find the cure for narcissistic personality disorder.
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